Here are some steps to troubleshoot a network proxy error:

1. Check if the network connection is working

Ping the router or the IP address of the computer that is having network issues.



2. Check the network settings

Verify that the settings for proxy, IP address, subnet mask, gateway, and DNS are correct.



3. Inspect the firewall

Properties of the firewall should be checked to make sure that the proxy settings are not interfering with the network connection.



4. Reboot the system

Restart the computer to make sure all the changes have been updated.